Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[SOLVED] Electrons movemnt from Base to Collector in NPN transistor

Status
Not open for further replies.

tahir4awan

Full Member level 4
Joined
Nov 29, 2010
Messages
202
Helped
16
Reputation
32
Reaction score
16
Trophy points
1,308
Location
Germany
Activity points
3,032
Electrons movement from Base to Collector in NPN transistor

What causes the electrons to move from base to collector in common emitter configuration. It is said that base is very thin so few electrons from emitter region will diffuse into base and rest of the electrons will move to collector region.
If the purpose of the thin base is only that then what is the function of positive supply at base?
 

Syncopator

Full Member level 6
Joined
Dec 15, 2010
Messages
368
Helped
70
Reputation
140
Reaction score
66
Trophy points
1,308
Location
N.E. Lincolnshire U.K.
Activity points
3,395
Re: Electrons movement from Base to Collector in NPN transistor

What causes the electrons to move from base to collector in common emitter configuration.
There are two currents in a transistor, the base/emitter and the collector/emmiter. I don't think it helps much to think of electrons and/or holes, just think of currents.

... what is the function of positive supply at base?
The base-emitter junction has to be forward biased, so the base needs to be positive with respect to the emitter on an NPN.
 

kak111

Advanced Member level 4
Joined
Mar 30, 2011
Messages
1,366
Helped
933
Reputation
1,868
Reaction score
907
Trophy points
1,413
Location
Finland
Activity points
10,942
I made a small info for you..........

View attachment Transistor_electr.pdf

what is the function of positive supply at base?
It makes electrons move over the diode BE
ie when voltage is high enougth to put diode to conductive state electrons can flow
over NP (EB) junction. (Si-BJT voltage BE is about 0.7V)

Regards KAK
 
Last edited:

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top